REMSAD VERSION 7.10 WITH SOURCE TAGGING

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REMSAD VERSION 7.10 WITH SOURCE TAGGING

• Inter-RPO Modeling Meeting
• May 25, 2004
• Shan He, Emily Savelli, Jung-Hun Woo,
• John Graham and Gary Kleiman, NESCAUM

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OBJECTIVES

• Evaluate performance of tagging module by
  comparing tagged and non-tagged model results
  with EPAs CSA model result
• Assess techniques for determining state
  contribution to sulfate PM fraction and total
  PM2.5 on regional scale
• Emphasis is on the technique, not the result!

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MODELING

• REMSAD V7.10
• - CB-IV micro-mechanism
• - parameterized aerosol chemistry and dynamics
• - SOA yield from anthropogenic and biogenic
  hydrocarbons
• - TAGGING SCHEME for sulfur species (SO2, GSO4,
  and ASO4), nitrogen, mercury and cadmium
• METEOROLOGY
• - Clear Skies Act (CSA) base year 1996 annual
  MM5 model run
• EMISSIONS
• - CSA 2001Proxy emissions

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CSA 2001 PROXY EMISSIONS

• 1996 Nonroad Rule Emissions 1996 inventory for
  all area, nonroad, mobile and point sources, for
  Canadian, Offshore and US, for criteria
  pollutants and mercury
• Multiplicative factors applied to 1996 Nonroad
  Rule US EGU, nonroad and mobile sources to create
  2001 emissions
• - Linear interpolation between 1996 Nonroad Rule
  and 2010 Transport Rule US non-EGU point and area
  sources to create 2001 emissions
• - 1996 Nonroad Rule Canadian, Mexican, Offshore
  and biogenics emissions

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• MODELING DOMAIN

- 120 (E-W) X 84 (N-S) grid cells - Cell size
(36km X 36km, 0.5o X 0.3333o) - E-W range 66
degrees W - 126 degrees W N-S range 24 degrees
N - 52 degrees N - Vertical extent Ground to
16,200 meters (100mb) with 12 layers
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MODEL EVALUATION
REMSAD V7.10 Non-tagging Run
EPA's REMSAD V7.06 Run
REMSAD V7.10 Tagging Run Group 1
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CONTRIBUTION (NJ Sulfate in PM2.5)
Percentage contribution of tagged sulfate to
PM2.5 at Brigantine
NJ Elevated Sources Contribute 1
PA Elevated Sources Contribute 4
All other non-tagged states in Tag Group 1 and
surface SO2 emission in whole US contributes 33
Surface emissions alone 14
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Tagging Next Steps

• Develop preliminary state contributions to
  sulfate from elevated point sources for
  contribution assessment
• Performance evaluation using 2002 meteorology and
  emissions
• Explore surface emission tagging nitrate tagging
• Refined analysis is likely to play a role in
  weight of evidence SIP work
  (See MV modeling presentation at 2pm)